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faqs

1. What are the drawbacks of plain concrete (without secondary reinforcement)?

•   Lower impact & abrasion/wear resistance
•   Brittle in nature i.e. need to improve ductility
•   Scope for improvement in flexural & tensile strength
•   Scope for improvement in damping / fatigue resistance
•   Scope for improvement in energy absoption
•   Does not adequatly safeguard steel reinforcement from water & salinity ingress causing corroion.

1a. How Fibre mechanics work in concrete?

There are more than 65-70 million fibres in one m3 of concrete which holds on the cement matrix. This arrests shrinkages stress (reduced micro cracks and permeability). Fibre matrix helps Improve energy absorption and abrasion resistance.

1b. What role cross section of Fibre plays in bonding?

World over round fibre is used. These fibres tend to slip out from cement matrix when load is applied. After years of research, Recron 3s has been developed in triangular shape which offers much improved mechanical bonding with cement matrix. Michigan State University concludes that triangular shaped fibre improves bonding by 40% over circular fiber.

2. What are Recron 3s fibres? What does Recron 3s do?

Recron 3s is a virgin polyester & polypropylene monofilament fibre. It is a specially Engineered and shaped (Triangular) synthetic fibre for use in concrete and mortar to Overcome shortcomings of concrete. Triangular fibres provide higher surface bonding.

Incorporation of discrete, discontinuous short fibres in the matrix of the concrete provides randomly distributed, multi-point secondary reinforcement, results in three dimensional crack Control and crack arrest mechanism. FRC with Recron 3S offers following major advantages:

Improving Concrete Quality and Long Term Durability:

Improving Physical Properties:

•  More Homogeneous/cohesive concrete
•  Arresting shrinkage & micro cracks
•  Reduced bleeding and segregation
•  Reduced water permeability

•  Impact resistance, Toughness
•  Ductile behavior, Damping property
•  Fatigue and abrasion resistance
•  Shrinkage induced cracks
•  Flexure and tensile strength
•  Shock absorption capacity

3. Where can Recron 3s be used?

In concrete and mortar i.e. anywhere and everywhere that cement is used, the fibre has some positive role to play.

a) Concrete :

b) Mortar:

•  Slab on Grade: All types of payments and overlays, industrial floors, roads, taxi ways, hangars etc.
•  Structural Concrete: Foundation (deep & shallow), machine foundation, slabs, column beams and lintel, bridge, decks & girders etc.
•  Water retaining structures: RCC retaining walls, water tanks Cross drains, swimming pools, hydel projects, check dams, canal lining, ETPs, jetties, ports, spillways etc.
•  Water proofing in rooftops, sunken toilets etc.
•  Shot Crete: Tunnel lining, rehabilitation, slope stabilization etc.

•  Plaster: Internal & external, stucco etc.
•  Water proofing: Brickbat coba, polymer coating etc.
•  Gunniting: Repairs & Retrofitting.
•  Hollow and solid blocks, pavers, tiles, railway sleepers, hume pipes and other CC pipes

3a. Can Recron 3s be used in Slab on Grade?

Yes, Recron 3s can be used in rigid pavements, industrial floors, roads, and airport runways, floors/ pavements laid with conventional vacuum-dewatering system and bridge wearing coats etc.